1/*
2 * bthidd.c
3 */
4
5/*-
6 * SPDX-License-Identifier: BSD-2-Clause
7 *
8 * Copyright (c) 2006 Maksim Yevmenkin <m_evmenkin@yahoo.com>
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $Id: bthidd.c,v 1.8 2006/09/07 21:06:53 max Exp $
33 */
34
35#include <sys/time.h>
36#include <sys/queue.h>
37#include <assert.h>
38#define L2CAP_SOCKET_CHECKED
39#include <bluetooth.h>
40#include <err.h>
41#include <errno.h>
42#include <signal.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <string.h>
46#include <syslog.h>
47#include <unistd.h>
48#include <usbhid.h>
49#include "bthid_config.h"
50#include "bthidd.h"
51
52static int32_t	write_pid_file	(char const *file);
53static int32_t	remove_pid_file	(char const *file);
54static int32_t	elapsed		(int32_t tval);
55static void	sighandler	(int32_t s);
56static void	usage		(void);
57
58/*
59 * bthidd
60 */
61
62static int32_t	done = 0; /* are we done? */
63
64int32_t
65main(int32_t argc, char *argv[])
66{
67	struct bthid_server	 srv;
68	struct sigaction	 sa;
69	char const		*pid_file = BTHIDD_PIDFILE;
70	char			*ep;
71	int32_t			 opt, detach, tval, uinput;
72
73	memset(&srv, 0, sizeof(srv));
74	memset(&srv.bdaddr, 0, sizeof(srv.bdaddr));
75	detach = 1;
76	tval = 10; /* sec */
77	uinput = 0;
78
79	while ((opt = getopt(argc, argv, "a:c:dH:hp:t:u")) != -1) {
80		switch (opt) {
81		case 'a': /* BDADDR */
82			if (!bt_aton(optarg, &srv.bdaddr)) {
83				struct hostent  *he;
84
85				if ((he = bt_gethostbyname(optarg)) == NULL)
86					errx(1, "%s: %s", optarg, hstrerror(h_errno));
87
88				memcpy(&srv.bdaddr, he->h_addr, sizeof(srv.bdaddr));
89			}
90			break;
91
92		case 'c': /* config file */
93			config_file = optarg;
94			break;
95
96		case 'd': /* do not detach */
97			detach = 0;
98			break;
99
100		case 'H': /* hids file */
101			hids_file = optarg;
102			break;
103
104		case 'p': /* pid file */
105			pid_file = optarg;
106			break;
107
108		case 't': /* rescan interval */
109			tval = strtol(optarg, (char **) &ep, 10);
110			if (*ep != '\0' || tval <= 0)
111				usage();
112			break;
113
114		case 'u': /* enable evdev support */
115			uinput = 1;
116			break;
117
118		case 'h':
119		default:
120			usage();
121			/* NOT REACHED */
122		}
123	}
124
125	openlog(BTHIDD_IDENT, LOG_PID|LOG_PERROR|LOG_NDELAY, LOG_USER);
126
127	/* Become daemon if required */
128	if (detach && daemon(0, 0) < 0) {
129		syslog(LOG_CRIT, "Could not become daemon. %s (%d)",
130			strerror(errno), errno);
131		exit(1);
132	}
133
134	/* Install signal handler */
135	memset(&sa, 0, sizeof(sa));
136	sa.sa_handler = sighandler;
137
138	if (sigaction(SIGTERM, &sa, NULL) < 0 ||
139	    sigaction(SIGHUP, &sa, NULL) < 0 ||
140	    sigaction(SIGINT, &sa, NULL) < 0) {
141		syslog(LOG_CRIT, "Could not install signal handlers. %s (%d)",
142			strerror(errno), errno);
143		exit(1);
144	}
145
146	sa.sa_handler = SIG_IGN;
147	if (sigaction(SIGPIPE, &sa, NULL) < 0) {
148		syslog(LOG_CRIT, "Could not install signal handlers. %s (%d)",
149			strerror(errno), errno);
150		exit(1);
151	}
152
153	sa.sa_handler = SIG_IGN;
154	sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT;
155	if (sigaction(SIGCHLD, &sa, NULL) < 0) {
156		syslog(LOG_CRIT, "Could not install signal handlers. %s (%d)",
157			strerror(errno), errno);
158		exit(1);
159	}
160
161	if (read_config_file() < 0 || read_hids_file() < 0 ||
162	    server_init(&srv) < 0 || write_pid_file(pid_file) < 0)
163		exit(1);
164
165	srv.uinput = uinput;
166
167	for (done = 0; !done; ) {
168		if (elapsed(tval))
169			client_rescan(&srv);
170
171		if (server_do(&srv) < 0)
172			break;
173	}
174
175	server_shutdown(&srv);
176	remove_pid_file(pid_file);
177	clean_config();
178	closelog();
179
180	return (0);
181}
182
183/*
184 * Write pid file
185 */
186
187static int32_t
188write_pid_file(char const *file)
189{
190	FILE	*pid;
191
192	assert(file != NULL);
193
194	if ((pid = fopen(file, "w")) == NULL) {
195		syslog(LOG_ERR, "Could not open file %s. %s (%d)",
196			file, strerror(errno), errno);
197		return (-1);
198	}
199
200	fprintf(pid, "%d", getpid());
201	fclose(pid);
202
203	return (0);
204}
205
206/*
207 * Remote pid file
208 */
209
210static int32_t
211remove_pid_file(char const *file)
212{
213	assert(file != NULL);
214
215	if (unlink(file) < 0) {
216		syslog(LOG_ERR, "Could not unlink file %s. %s (%d)",
217			file, strerror(errno), errno);
218		return (-1);
219	}
220
221	return (0);
222}
223
224/*
225 * Returns true if desired time interval has elapsed
226 */
227
228static int32_t
229elapsed(int32_t tval)
230{
231	static struct timeval	last = { 0, 0 };
232	struct timeval		now;
233
234	gettimeofday(&now, NULL);
235
236	if (now.tv_sec - last.tv_sec >= tval) {
237		last = now;
238		return (1);
239	}
240
241	return (0);
242}
243
244/*
245 * Signal handler
246 */
247
248static void
249sighandler(int32_t s)
250{
251	syslog(LOG_NOTICE, "Got signal %d, total number of signals %d",
252		s, ++ done);
253}
254
255/*
256 * Display usage and exit
257 */
258
259static void
260usage(void)
261{
262	fprintf(stderr,
263"Usage: %s [options]\n" \
264"Where options are:\n" \
265"	-a address	specify address to listen on (default ANY)\n" \
266"	-c file		specify config file name\n" \
267"	-d		run in foreground\n" \
268"	-H file		specify known HIDs file name\n" \
269"	-h		display this message\n" \
270"	-p file		specify PID file name\n" \
271"	-t tval		specify client rescan interval (sec)\n" \
272"	-u		enable evdev protocol support\n" \
273"", BTHIDD_IDENT);
274	exit(255);
275}
276
277